After each question, the app updates the number of attempts for each type of question and how many you answered correctly. It also stores the time it took you to complete the last question of that type as well as the average time you have taken to answer those questions. These values apply to each question type separately, so when you generate a new population, the values will update to correspond to the type of question you are currently addressing.
The app also keeps track of your choice of whether or not to answer a question. If you want to skip a question, you can do so by just clicking on the "Generate Population" button again. When you do this, the question is skipped and you'll get a new one. However, there is a limit to how many questions you can skip without consequences (the number of acceptable skips decreases as you get to higher rankings). If you skip too many questions, you will start to lose points for that question type.If you lose enough points, you can even lose a rank you earned by getting questions correct. Every time you earn a new rank, the number of questions you have skipped is forgotten. In addition, every time you get a question correct, one of your skips is "forgiven".
You can also reset the number of skips by resetting the stats, although this will reset all your stats, not just the number of skips.
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